mersum
Mersum is a fictional material widely used in science fiction and world-building. It is described as a versatile substance with exceptional energy storage and resilience, suitable for a variety of applications in imagined economies and technologies. In most depictions, mersum is a dense, metallic substance that can be fabricated into components with minimal waste and that remains stable across a wide range of temperatures. The most distinctive property is its high energy density, enabling large energy storage per volume, and some portrayals grant quasi-superconductive behavior that reduces transmission losses.
The name mersum appears across different authors and media, often treated as a class of materials rather
In lore, mersum is scarce and valuable, mined from deep planetary crusts or produced in high-energy reactors,